baldwin



J. S. BALDWIN.

ELEVATOR.

No. 76,692. PatentedApr; 14 1868.

MMW M JAMES S. BA'LD'W-IN, OF NEWARK QNEW- JERSEY.

Letters Patent No. 76,692, dated April 14,1868.

IMPROVED ensures.

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TO ALL vWHOM IT MAY CONCERN:

Be it known that I, Jeans S. BALnwm, of Newark, in thecounty of Essex, and State of New Jersey, have invented a new and improved Method of Constructing Elevators Used for Transporting Passengers; and Ida hereby declare that the following is-a full and eiract description thereof, reference being-had to the accompanyng drawings, and to the letters of reference marked thereon, making a partioi' this specification.

My invention has for its object the prevention oi those accidents which occur through the interposition of some part of the human. body between the edge of the elevator while'in motion, andthc edge of the landing. To this end I construct thc saidcdges in such amunncr that they will re'cede when brought contact with an interposed body, leaving a clear space of suflicicnt width to prevent any injuryt In the several figures' of the drawing, let A represents themain platform of the elevator, and B the yielding or receding portion moving on the friction-rollers C C (1. Y is a li'ricshowing the vertical direction of the slides. P P'is' the landing. It is apparent that if the platform l B'is descending, an interposed object,

shown by the outline between I and D,-must, by its contact, impart an upward motion (relatively to B) to the bar I), under-partial 'rotativc motion to the bent l'cyers E E E E, Figuresl and II. The'nd, e, of each lever being connected with the main platform A by the rod' or cord G G, the upward motion of the bar D must cause a backward motion of the platform B, to ancxtent determined .bv-the relative length of the twfil'fl f h "lever E E.

In the plan described, the platform or' edge is withdrawn by the immediate action of the force applied, but, when B is large and heavy, it will be necessary to employ a reserve force, which, being released or called into action by a slight pressure on D, will cause the'movementof the several parts, as hereinbefore described, to be made at once, as in-Fi'gure IV, where G is attached and imparts its motion,to'the handle cl, and also to the arm pendent from the joint N. This arm, with one:on the opposite side, carries the drum K, from which passes the cordn n, which is firmly attachedto the projection M is a weak spring drawing K back when there is no -tension on G G. The cylinder A. is fitted with a piston, .the rod, g, from which passes out through a stuilingbox, and is firmly attached to Q. pipe and fnuoetor stop-cock place the front end of B in'com'munication with a suitable reservoir of gas or liquid under pressure. The handle dot the stop-cock has been before referred to. It, now, G is drawnby pressure on D, the handle d, which is at tached to it-, will heturned,- the stop-cock opened, andthe gas or liquid will drive back the piston, its-rod q, and the projection Q, and yielding platform- B, as indicated by the-arrow. Instead of gas or liquid under pressure, I prefer to employ a compressed helical or other spring released by drawing the catch' or bolt f, Figure VI. A. simple but less compact substitute for,

the spring is the weight N, cord w, and pulley a. The weight is released by drawing a suitable catch, g. The same motion of the rod Gibring s the druin K in contact with the upright stationary piece S S, the friction of which against K causes it to revolve,"drawing back the cord a n, and with it Q and B, towhich it is attached, It is obvious that by the. combined action of thc several appliances described, the withdrawal of 13 must necessarily result from any pressure upon D. r v

The bar D could be replaced by a-cord or chain passingback over pulleys, as in Figure VIII, or by a bellows, X, Figure VILthe compressed'air passing through the flexible pipe 11 to a cylinder like 'A, Fig. IV. A similar cylinder, reversed in its direction, throwing theadrum is into gear K and S S, 'could,'ii' desirable, be converted into a rack and pinion by the addition of teeth.

I apply the same machinery to the landings, the drum is receiving-its motion fromsome projecting portion of the elevator, or from some portion of 'itsi'ih'achiriery having a coincident motion, and occupying the same relative position. I

Where the ways or slides of the elevator are suiiicicntlyinclined, as in Figure V, the yiclding platform will recede by direct pressure of an interposed body, returning by the action of light sprin s of India rubber or wire, as R R, II and III.

By the application of the principles hereinbeforc d escribed, #:h platform B, being divided'in the middle, could be'caused to recede laterally, as shown by the arrows U U and the line J' J, Figure III.

What I lzyim my invention, and desir to secure by L'gtters Patent, is The-withdrawal of th e yielding platfofln or edge B by the action of. an interpq sed body, by means and in the manner describd.

' JAMES S. BALDWIN.

-Witnesses:

G; S. BALDWIN, S. A. BALDWIN. 

